Fuse



Patented Aug. 31, 1948 UNITED STATES 3 Claims.

The invention described herein may be manufactured and used by or forthe Government for governmental purposes, without the payment to me ofany royalty thereon.

This invention relates in general to a fuse and more particularly it hasreference to means for holding the relatively rotatable elements of afuse casing in position of adjustment.

The purpose of the invention is to provide a structure in which a simpleand effective ring between a base and setting cap will permit relativemovement. of these members to set the timing mechanism. of the fuse andwill prevent their derangement under the influence of centrifugal forceduring flight. The locking connection is so arranged that the parts maybe quickly connected and disconnected.

The specific nature of the invention as well as other objects andadvantages thereof will clearly appear from a description of a preferredembodiment as shown in the accompanying drawings in which:

Fig. 1 is a longitudinal sectional view of a fuse casing whose units areheld in adjustedv position by the improved ring;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1;

Fig. 3 is an enlarged sectional view on the line 3-3 of Fig. 2.

Referring to the drawings by characters of reference there is shown afuse casing comprising a base 5 and a rotatable setting cap 6. The baseis formed with a reduced upper part I for receiving the lower end of thecap which rests upon an annular seat 8 established in the base.

The lower end of the cap is provided internally with a circumferentialgroove 9 which, when the cap is resting on the seat, registers with acircumferential groove I provided externally on the reduced part I ofthe base and including a chamfered front wall Illa. The outer wall ofthe groove 9 is formed with equidistantly spaced recesses or depressionsll, preferably four in number and each recess is in line with a tappedopening I2 provided in the wall of the cap. The cap is also providedwith an opening IS in line with the groove 9 and positioned between twoof therecesses.

A split wire coupling ring I4 prior to assembly, is housed completelywithin the groove 9 and formed with arched projections adapted to seatin the recesses II. The ends l6l6 of the ring are bent outwardly anddisposed in the opening I3 which is then filled with a material such assolder.

amended April 30, 1928; 370' O. G."l.5'7)

When the cap and the base are brought into assembled position set screws[1 are applied in the tapped openings l2 and act on the archedprojections l5 of the ring to move the ring inwardly whereby portions ofthe ring adjacent the projections are forced to enter the groove Ill.The amount of pressure applied to the ring through the screws regulatesthe frictional contact between the ring and the base and determines theresistance to rotation of the parts. An adjustment is made which willpermit rotation of the cap to set the timing mechanism of the fuse butwhich will prevent relative movement of the parts under the influence ofcentrifugal force during flight.

In disconnecting the cap and base the screws are moved outwardly torelieve pressure on the ring and the ring will move back into the groove9 due to its inherent resiliency, but if it should fail to move theinclined front wall Illa will cam it outwardly when the cap and base areseparated.

-It will be readily understood that the mating arrangement of the capand base may be reversed and that more than one coupling ring may beemployed.

I claim:

1. In a fuse casing, a pair of telescoped and relatively rotatablemembers having registering annular grooves, the base of the groove inthe outer member having equidistantly spaced recesses, said outer memberhaving a tapped opening in line with each recess and having an openingdisposed between recesses, a split coupling ring normally disposed inthe groove of the outer member and having arched projections seating inthe recesses and bent ends disposed in the opening between recesses,screws in the tapped openings for applying pressure to the archedprojections of the ring and displacing the unarched portions of the ringinto the groove of the inner member.

2. In a fuse casing, a pair of telescoped and relatively rotatablemembers having registering annular grooves, the base of the groove inthe outer member having equidistantly spaced recesses, said outer memberhaving a tapped opening in line with each recess, a split coupling ringnormally disposed in the groove of the outer member and having archedportions seating in the recesses, screws in the tapped openings forapplying pressure to the arched projections of the ring and displacingthe unarched portions of the ring into the groove of the inner member.

3. A fuse comprising a first part having a cylindrical outer surface,there being a first peripheral groove in said surface, a second parthaving an internal cylindrical bore adapted to fit smoothly about thecylindrical surface of said first part, there being a second peripheralgroove in the surface of said bore, said grooves coacting to form acircular channel when said parts are in assembled relation, there beinga plurality of circumferentially spaced recesses in the base of one saidgroove, there being a tapped hole opening 10 Number into each respectiverecess, a set screw threaded into each said hole, a split ring lyingwithin said one groove when said parts are in unassembled relation andhaving its ends anchored to the part containing said one groove, saidring having projections each extending into a respective recess, eachset screw, when turned home, engaging a respective projection to forcethe adjacent ring 4 lation while enabling adjustment of the frictionresisting relative axial rotation of said parts.

EUGENE J. FIX.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Name Date 844,223 Wieser Feb. 12, 1907 969,497Schneider Sept. 6, 1910 1,496,271 Junghans June 3, 1924 2,188,048Junghans Jan. 23, 1940 I FOREIGN PATENTS Number Country Date 60,474Germany Jan. 5, 1892 625,936 France May 2, 1927

